Category: Administration / Server

TP-Link Outdoor Accesspoint AC1200 (EAP225-Outdoor) Hardware Version v1 – ssh enabled (but NO WDS Bridging Client/Bridge/Repeater/AP Client Router mode) – GNU Linux script to monitor Wifi WLAN connection link speed
13.06.2021

How to created multiple Wifi AccessPoints connecting (WDS Wifi Bridge) to one central Internet-Wifi-AccessPoint – Difference between TL-WA901N and TL-WA901ND where the Chinese and especially TP-Link and Huawai are very strong is data over radio (4G/LTE/5G/Wifi…) especially the TP-Link products […]

Zehntausende Mail-Server wegen Exchange-Lücke gehackt – Cloud oder Klaut – com-magazin.de Security Newsletter
12.03.2021

scroll down to ENGLISH “Zehntausende Mail-Server wegen Exchange-Lücke gehackt.  Wegen einer vor wenigen Tagen bekanntgewordenen Sicherheitslücke sind laut US-Medienberichten Zehntausende E-Mail-Server von Unternehmen, Behörden und Bildungseinrichtungen Opfer von Hacker-Attacken geworden. “Deutsche Unternehmen sind im internationalen Vergleich besonders stark von dieser […]

phpBB – Profile Avatar Picture 6KBytes size limit
17.02.2021

… because one also cares about beauty… a default avatar picture is not an option… but phpBB has a very strict 6KBytes max file size limit for Profile Avatar Pictures…  which is almost impossible to reach with format.jpg or format.png […]

GNU Linux Bash – script for troubleshoot long term reliability (ping) and bandwidth (speed) benchmark-test – testing network internet connection uplink connectivity and reliability
21.01.2021

this script is for cront-job regular measurement of the available (download) bandwidth, by downloading a 100MByte dd crated (https://dwaves.de/testfile) testfile created like this (creditz): head -c 100m /dev/zero | openssl enc -aes-128-cbc -pass pass:”$(head -c 20 /dev/urandom | base64)” > […]

LibreBoot – (how to mount luks2 encrypted volume) LVM encrypted volumes needs correct CMOS clock time – Volume Group not found – failed to read int token error parsing metadata
03.12.2020

to recover the data: how to mount luks2 encrypted volume possibility: remove harddisk, attach to sata2usb adapter, then mount on different machine like this: # unlock encrypted harddisk udisksctl unlock -b /dev/sdb5 udisksctl mount -b /dev/mapper/ubuntu–vg-root Mounted /dev/dm-1 at /media/dpm/e8cf82c0-f0a3-41b3-ab28-1f9d23fcfa72 […]